Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [energy]

Energy is defined as the amount of work that can be performed by a force, measured in joules (J). Energy is power integrated over time; power (W) is energy per second (J/s). This is a poor tag to use. Please consider if your question relates to energy as defined in physics; don't use it as a synonym for power or capacity.

Energy is defined as the amount of work that can be performed by a force, measured in joules (J). Energy is power integrated over time; power (W) is energy per second (J/s).

This is a poor tag to use. Please consider if your question relates to energy as defined in physics; don't use it as a synonym for power or capacity.

526 questions
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Convert watts (collected at set interval over set time period), into kWh

I have an energy monitor which collects the power usage (W) of a device, every 3.11 seconds. If I want find the total energy consumption (kWh) of the device over a set time period, how would I do it?
bananamana
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How efficient are micro turbines in generating efficent energy?

Would one large wind turbine be more efficient than many small wind turbines in theory?
Gabriel Fair
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Express bytes over cat5e as energy?

I'm interested in this purely from personal interest, I'm not a student. Can I express 1024 bytes of information travelling over cat5e as joules (or some measure that fits into energy of e=mc^2 )? How? Would this be radically different if it were…
Incognito
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Calculation for energy consumed over a period of 24 hours

I'm currently studying the textbook Fundamentals of Electric Circuits, 7th edition, by Charles Alexander and Matthew Sadiku. Chapter 1.5 Power and Energy gives the following practice problem: Practice Problem 1.6 A home electric heater draws 12 A…
The Pointer
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Does shutting down and repowering CPU consume more energy?

I have an internetshop that has 20 CPUs. Only 50% on average are being used throughout a regular day and almost 80-100% during saturdays. I use a Server-Client to Shutdown an unused computer but sometimes after 5-30 minute range it will be turned on…
Sid
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Whole current meter

I need information on the major difference between an WHOLE CURRENT energy meter and a KWH energy meter, if there is.Any link or resource information would be of great help. Thanks
Paul A.
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Is the sun enough to power all of our needs?

If so why isn't solar power being implemented more so? I don't mean to as a govt conspiracy post. But what's holding us back from achieving this, if it is indeed possible.
Foo Fighter
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Understanding Energy consumption - 3-phase Power Meter - Active (forward, reverse) and Apparent

I'm looking at 3-phase power data from a machine using a Fluke monitor. I've got 'Energy Analyze Plus' software which then calculates lots of interesting things and I'm trying to understand what I need! I want to determine what the energy used is by…
CStanfed
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Checking CS5463 Power Measurement IC

I am using CS5463 for energy metering application. Is there any way to check if IC is working properly without communicating with the IC through SPI interface? I just want to make sure that the connections are right before programming the…
Khurram
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Energy direction in an electronic circuit

I've been reading a number of materials trying to understand the physics that allow electricity to be possible. I'm confused by this virtual positive [charged] particle (often called a test particle) that is used to explain the direction/properties…
Anonymous555
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kilowatt hour and kilowatt per hour

Electric energy is sold by the kilowatt hour (kWh). A kilowatt is a unit of power. A kilowatt hour is a unit of energy. It's the sum of power consumption over a given period in hours. As in example, saying a motor consumes 100 kW and runs for 20…
OMAR
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Why are thresholds for energy detection and preamble detection different in 802.11 standard?

Assuming a 20 MHz band, it is -62 dBm for the data and -82 dBm for the preamble. Source: August 2013 doc.: IEEE 802.11-13/0994r0
user3656142
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Instantaneous power consumption value

If, for a large motor, you are given cumulative kWh values at 5-minute increments, how would you determine an instantaneous power consumption value?
Rehan Shaikh
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Kid's geothermal power plant science project

I’m from Cape Town. My daughter is doing a geothermal energy power plant for her science project and we are battling to get the turbine with the DC motor to spin when steam hits it. The Dc motor is not loose enough so won’t turn to generate…
Jaclyn
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energy stored in circuit under steady circuit

Hello there i want to solve this problem I solved above problem this way. In steady state condition, capacitor should be replaced by open circuit. so 2 ohm, 4 ohm and 2 ohm these three resistors are in series. so total resistor is 8 ohm. and…
Beginner
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